Picture replacement through opencv in python

Images used and the code below

import cv2
import numpy as np
pic1=cv2.imread("mamtause.jpg")
pic01=pic1[75:400,80:350]
pic2=cv2.imread("narendramodi.jpg")
pic2[75:400,80:350]=pic1[75:400,80:350]#replacing modi's face with mamtabanerjee
cv2.imshow("modi",pic2)
cv2.waitKey()
cv2.destroyAllWindows()